Apparatus for the reduction of paper-pulp



(No Model.)

' J. W. DIXON.

APPARATUS FOR THE REDUCTION OF PAPER PULP.

No. 276,163. Patented Apr.24, 1883.

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IINVENTOR WITNESSES:

N. PETERS. Phohrljlhcgnphlr. washm im. D30.

NITED STATES Fries.

ATENT APPARATUS FOR THE REDUCTION OF PAPER-PULP.

SPECIFICATION forming part of Letters Patent N0. 276,163, dated April24, 1883.

Application filed November 14, 1882. (No model.)

To all whom it may concern ,Be it known that I, JOHN W. DIXON, ofPhiladelphia, Pennsylvania, have invented a new an d useful Improvementin Apparatus for the Reduction of Paper-Pulp from Wood,Straw, and otherVegetable Fiber, of which the following is a full, clear, and exactdescription, reference being had to the annexed drawing, making parthereof.

My invention consists of a digester for reducing fiber to paper-pulp, asupplemental chamber connected with the same by means of pipes, a pumplocated upon the said pipes for circulating the alkaline liquor from thebottom of the digester through said pipes and supplemental chamber backto the interior upper part of said digester, and a steam-coil or steamchamber or chambers within said supplemental chamber to heat thealkaline liquor in the course of its passage back to the digester.

I will describe the construction and operation of my device.

The drawing represents a vertical longitudinal section of an uprightpaper-pulp digester, the supplemental chamber, the pipes connecting thelatter with the digester, the fan or other pump for circulating theliquor, suitable cooks for checking the flow of the alkaline liquor, anda steam-coil or spiral chamber within the supplemental chamber, to heatthe alkaline liquor in its passage through the latter.

A is a closed pulp-digester, in which the pulp is cooked under pressure;B, a sliding valve for discharging the contents of the same G, aperforated diaphragm to sustain the vegetable matter or pulp, and yetallow a free circulation of the liquor through it; D, an upperperforated diaphragm for spreading the alkaline liquor over the pulp assaid liquor enters the top of the digester in the course of circulation.

E is a pipe leading-from the bottom of the digester A to the fan orother pump, F.

E is a pipe leading from the pump F to the bottom of the supplementalchamber G.

H is a pipe leading from the top of the supplemental chamber G back tothe digester A.

I I are suitable cooks ,for regulating the flow of the alkaline liquor Jis asteam coil ofpipe passingfrom a steamgenerator or boilerinto thesupplemental chamber G, to heat the contents of the latter in theirpassage through it. The steam enters at the point J, and has its exit,together with any condensation that may occur, at the point denominatedJ. K K are cocks or valves to regulate the flow of steam. The end J ofthe coil J is connected directly with the steam-space of a boiler orgenerator. The end J is also connected with the steam boiler orgenerator by means of a pump or ordinary trap, through which the wasteor condensed steam is conducted back to the said boiler. Instead ofsteam, hot water may be used in the coil J. The ends J J in such casemay be connected with a coilor chamber orchambers,which latter may beheated by direct fire heat, the water being driven through thesechambers and coil J by means of a pump, whereby the circulation of thehot water may be maintained through the coil J and through the coil orchambers heated by the fire, to thoroughly and continuously heat thecontents of supplemental chamber G.

The coil J may be substituted by or supplemented with a series ofsteam-conduit chambers or a single chamber, as I consider the coil J tobe a continuous spiral chamber and the substitutes which I havementioned to be equivalents of such chamber or chambers.

The operationis as follows: The digesterAis first filled with wood orother vegetable fibrous material through the man-hole L, the cock 1being closed. The alkaline liquor is then pumped into the digesterthrough the manhole L,-in the proportion of about eighteen hundredgallons, of a strength of about 6 Baum, to two cords of wood. Theman-holeL is then closed, the cocks I and I are opened, and the pump Fis started. This circulates theliquor, (by a pump, F,) through pipe E,supplemental chamber G, pipe H, digester A, and pipe E, back to the pumpagain, and so on continuously during the operation of cooking. In themeantime, at the beginning of the operation of pumping or circulating,the cooks or valves E E are open, and steam or hot water, as above.described, entering at the point J, is continuously circulated throughthe coil or spiral chamber J, whereby the contents in passage throughthe chamber G are heated. I for the reduction of vegetable fiber topaper- 20 The continuous circulation of the alkaline liquor through thedigester A and its contents is maintained throughout the operation ofpulping by means of the pump F, and the continuous circulation of thesteam or hot water through the coil J is also continuously maintained bythe means already described.

I am well aware of the Letters Patent No. 168,382, formerly granted tomyself, together with the other United States Letters Patent granted tome during the period elapsing from 1864 to the present time, for variousprocesses and apparatus for reducing wood and other vegetable fiber topaper-pulp; but I do not claim any of these in this above-describedinvention; but

What I claim as new is- The combination of the digester A, adapted pulp,supplemental heating-chamber G, connected with said digester by suitablepipes, E, E, and H, pump F, located upon one of these pipes, tocirculate the liquor from the bottom of the digester through thesupplemental heatingchamber to the top of the digester again, and aheating coil or chamber, J, within said supplemental chamber G, saidchamber J being adapted for the passage of steam or hot water throughit, whereby the alkaline liquor in course of circulation through chamberG may be heated, substantially as and for the purpose described. 1

JOHN W. DIXON.

Witnesses:

WM. H. CARSON, GEORGE E. BUCKLE Y.

